How Do you over hear a conversation on a new model BT phone?

This may seem a strange one to ask but I have two cordless phones and I was wondering when someone is on one of the phones is it possible to pick up the other phone and listen to the conversation? if it is how do you do it?

Answers:

My gutt tells me you%26#39;re up to something else. like listening to a neighbor becasue you 2 may have similar phones.

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